/// <summary>
/// Attempt to find the first type of integer that a number can fit into
/// </summary>
/// <param name="image"></param>
/// <param name="isHex"></param>
/// <param name="negated"></param>
/// <param name="services"></param>
/// <returns></returns>
public static LiteralElement Create(string image, bool isHex, bool negated, IServiceProvider services)
{
StringComparison comparison = StringComparison.OrdinalIgnoreCase;
if (isHex == false)
{
// Create a real element if required
LiteralElement realElement = RealLiteralElement.CreateFromInteger(image, services);
if ((realElement != null))
{
return(realElement);
}
}
bool hasUSuffix = image.EndsWith("u", comparison) & !image.EndsWith("lu", comparison);
bool hasLSuffix = image.EndsWith("l", comparison) & !image.EndsWith("ul", comparison);
bool hasUlSuffix = image.EndsWith("ul", comparison) | image.EndsWith("lu", comparison);
bool hasSuffix = hasUSuffix | hasLSuffix | hasUlSuffix;
LiteralElement constant = default(LiteralElement);
System.Globalization.NumberStyles numStyles = NumberStyles.Integer;
if (isHex == true)
{
numStyles = NumberStyles.AllowHexSpecifier;
image = image.Remove(0, 2);
}
if (hasSuffix == false)
{
// If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.
constant = Int32LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
return(new UInt64LiteralElement(image, numStyles));
}
else if (hasUSuffix == true)
{
image = image.Remove(image.Length - 1);
// If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else if (hasLSuffix == true)
{
// If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.
image = image.Remove(image.Length - 1);
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if ((constant != null))
{
return(constant);
}
else
{
return(new UInt64LiteralElement(image, numStyles));
}
}
else
{
// If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.
Debug.Assert(hasUlSuffix == true, "expecting ul suffix");
image = image.Remove(image.Length - 2);
return(new UInt64LiteralElement(image, numStyles));
}
}
/// <summary>
/// Attempt to find the first type of integer that a number can fit into
/// </summary>
/// <param name="image"></param>
/// <param name="isHex"></param>
/// <param name="negated"></param>
/// <param name="options"></param>
/// <returns></returns>
public static LiteralElement Create(string image, bool isHex, bool negated, ExpressionBuilderOptions options)
{
const StringComparison comparison = StringComparison.OrdinalIgnoreCase;
if (isHex == false)
{
// Create a real element if required
var realElement = RealLiteralElement.CreateFromInteger(image, options);
if (realElement != null)
{
return(realElement);
}
}
var hasUSuffix = image.EndsWith("u", comparison) & !image.EndsWith("lu", comparison);
var hasLSuffix = image.EndsWith("l", comparison) & !image.EndsWith("ul", comparison);
var hasUlSuffix = image.EndsWith("ul", comparison) | image.EndsWith("lu", comparison);
var hasSuffix = hasUSuffix | hasLSuffix | hasUlSuffix;
LiteralElement constant;
var numStyles = NumberStyles.Integer;
if (isHex)
{
numStyles = NumberStyles.AllowHexSpecifier;
image = image.Remove(0, 2);
}
if (hasSuffix == false)
{
// If the literal has no suffix, it has the first of these types in which its value can be represented: int, uint, long, ulong.
constant = Int32LiteralElement.TryCreate(image, isHex, negated);
if (constant != null)
{
return(constant);
}
constant = UInt32LiteralElement.TryCreate(image, numStyles);
if (constant != null)
{
return(constant);
}
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
if (constant != null)
{
return(constant);
}
return(new UInt64LiteralElement(image, numStyles));
}
if (hasUSuffix)
{
image = image.Remove(image.Length - 1);
// If the literal is suffixed by U or u, it has the first of these types in which its value can be represented: uint, ulong.
constant = UInt32LiteralElement.TryCreate(image, numStyles);
return(constant ?? new UInt64LiteralElement(image, numStyles));
}
if (hasLSuffix)
{
// If the literal is suffixed by L or l, it has the first of these types in which its value can be represented: long, ulong.
image = image.Remove(image.Length - 1);
constant = Int64LiteralElement.TryCreate(image, isHex, negated);
return(constant ?? new UInt64LiteralElement(image, numStyles));
}
// If the literal is suffixed by UL, Ul, uL, ul, LU, Lu, lU, or lu, it is of type ulong.
Debug.Assert(true, "expecting ul suffix");
image = image.Remove(image.Length - 2);
return(new UInt64LiteralElement(image, numStyles));
}